No, just the one signal wire (IPU Speed/Freq) is routed to the I/O Auxiliary Harness.
Dominator Auxiliary Harnesses: https://www.holley.com/products/fuel...efi/harnesses/
To connect up to 4 Inputs & Outputs to the EFI Main Harness, use I/O Auxiliary Harness 558-400.
Eight Wire I/O Auxiliary Harness Connector Pin-Out (also in the Holley EFI Wiring Manual - LINK):
Pin A...A12...White/Blue (Input #1) F,5,2,T,H,G
Pin B...A3....White/Red (Input #2) F,5,2,T,H,G
Pin C...A13...White/Black (Input #3) F,5,G
Pin D...A4....White/Green (Input #4) F,5,G
Pin E...B12...Gray/Yellow (Output #1) H,P+
Pin F...B11...Gray/Red (Output #2) H,P+
Pin G...B10...Gray/Black (Output #3) G,P−
Pin H...B3....Gray/Green (Output #4) G,P−
http://documents.holley.com/199r10516.pdf (Holley 558-400 I/O Auxiliary Harness Instructions)
The 558-400 I/O Auxiliary Harness is 20 feet long.
It's "plug & play" into the main harness, and an easy way to connect common things like an electric cooling fan (LINK).
This I/O Auxiliary Harness isn't required for the optional oil & fuel pressure transducers, which are also "plug & play" into the main harness.
The oil & fuel pressure transducers are used for Data Monitoring, Data Logging and setup Outputs based on oil & fuel pressure.
Yes, the other wire is grounded.Or would I just run one to that, and then ground the other cable from the sensor?
http://forums.holley.com/showthread....3598#post53598 (Wiring Additional Sensors - HP & Dominator ECUs)